lO ROYAL SOCIETY OF CANADA 



Plate I. 



Figure 1. — Coalesced parietals of Centrosauriis apertus as seen from 



above; one-eighth natural size. 

 Figure 2. — Right lateral aspect of the same; similarly reduced. 

 Figure 3. — Lateral aspect of nasal horn core of C. apertus; one-eighth 



natural size. 

 Figure 3a. — Outline of transverse section of the same, similarly 



reduced. 



